Essential Electrical System Types

[bcorbin]

Doing a code review here and trying to cross my i's and dot my t's. :wink:

Can anyone tell me where it stated which kind of essential electrical system is required in health care facilities? (Type I, II, or III)? I see a lot of stuff in NFPA 70 and 99 and telling me what is in each, but not where each is required.

 

[anbm]

What is type I, II, III electrical essential system? Healthcare emergency system should follow NEC-517 and NFPA-99, 101, 110 rules.

 

[steve66]

Do you mean Level 1 or Level 2??

From NFPA 110:

4.4* Level.
This standard recognizes two levels of equipment installation, performance, and maintenance.

4.4.1* Level 1 systems shall be installed when failure of the equipment to perform could result in loss of human life or serious injuries.
4.4.2* Level 2 systems shall be installed when failure of the EPSS to perform is less critical to human life and safety and where the authority having jurisdiction shall permit a higher degree of flexibility than that provided by a Level 1 system.


Type is also in NFPA 110. Type 10 means 10 seconds max to transfer to emergency power.


The class is the length of time the emergency source will last.